What are valence electrons and why are they important to know about for bonding of atoms into molecules?
Answer:
valence electrons are the electron in an outermost shell of an atom of an element (it is also called the outermost electron).
They are important for bonding because, when you bond two or more atom of an element, it is the outermost electron (valence electron) that will do the sharing of electrons when two atoms are bonded together.
Which combination is most likely to form a precipitate?
A. ammonium hydroxide
B. barium chloride
C. calcium hydroxide
D. calcium acetate
E. iron hydroxide
Answer:
A - Ammonium Hydroxide (NH3)
Explanation:
• Metals are just too weak
• Calciums' have a low success rate
• Barium is good, but Ammonium is just stronger.
(This is just an opinion, I could definitely be wrong so just do corrections in class. Sorry)
Answer:
A
Explanation:
I think lol
which are exmaples of chemical change?
•baking cookies
• The statue of liberty's metal tarnishes from copper to green
• cold butter melts into liquid when heated
•salt is dissolved into freshwater
•Food scraps decompose into fertilizer in a compost pile
• frying changes the color and texture of an egg
•ocean water evaporates to water vapor on a hot day
•lighting a match
Answer:
C: salt is dissolved into freshwater
D: salt is dissolved into freshwater
F: frying changes the color and texture of an egg
G: ocean water evaporates to water vapor on a hot day
cal the vol of carbon(ii)oxide produced at stp by. d dehydration of 6.00g of methanoic acid with concentrated H2SO4 carbon=2 oxygen=16 hydrogen=1
molar volume = 22.4dmcube
The volume of CO= 2.912 L
Further explanationGiven
Dehydration of 6 g of methanoic acid with H2SO4
Required
The volume of CO
Solution
Reaction
HCOOH ⇒ CO+H₂O
MW = 1.Ar C+2.Ar H+2.Ar O
MW = 1.12+2.1+2.16
MW= 46 g/mol
mol = mass : MW
mol = 6 g : 46 g/mol
mol = 0.13
From equation, mol ratio HCOOH : CO, so mol CO = 0.13
Vm = 22.4 L
so for 0.13 mol :
= 0.13 x 22.4 L
= 2.912 L
which part of a human cell contains chromosomes
Answer:
nucleus
Explanation:
I’ll give people points if they answer this plz(math)
Minerals are only used for gemstones and jewelry.
True
False
Answer:
false
Explanation:
the answer is false because there is minerals in our water, ect.
Answer:
False because there are many minerals used for many different things
3.4 g of AGno3 are dissolved to make a 200 ml solution what is the molarity
Answer:
hehe you might think im crazy but this answer makes no sEnSe
Explanation:
In the chemical formula for table sugar C12H22O11, How
many oxygen atoms are in each sugar molecule?
Answer:
Number of oxygen atom = 11
Explanation:
Given:
Table sugar C₁₂H₂₂O₁₁
In the given formula;
Number of carbon atom = 12
Number of hydrogen atom = 22
Number of oxygen atom = 11
Answer:2
Explanation:2w2222
Which of the following statements accurately
paraphrases evidence from the article to support
the conclusion?
A
Quantitative data is based on numbers, while
qualitative data is based on observations.
B.
Qualitative observations often lead to deeper
study using quantitative measurements.
С
Qualitative data is based on numbers, while
quantitative data is based on observations,
D
Quantitative observations often lead to deeper
study using qualitative measurements
Please help due soon.
Answer:
X
Explanation:
because it is the greatest
what are the 3 phases of matter?
Answer:
The three major phases of matter are Solid, Liquid, and Gas. But there is also Plasma
the three-legged dog, has a mass of 24Kg and accelerates .85 m/s. How much force is needed to get Lucky moving
Answer:
the answer is 2040
Explanation:
force is given as the product of mass and acceleration
What frequency is radiation with a wavelength of 5.00 x 10^-6 cm? In what region of the electromagnetic spectrum is this radiation?
P.S it's due today
Answer:
f = 6 × 10^15 Hz in the ULTRAVIOLET (UV) region
Explanation:
Using λ = v/f
Where;
λ = wavelength (m)
v = speed of light (3 × 10^8m/s)
f = frequency (Hz)
According to this question, λ = 5.00 x 10^-6 cm
= 5.00 x 10^-8 m
λ = v/f
f = v/λ
f = 3 × 10^8 ÷ 5.00 x 10^-8
f = 0.6 × 10^(8+8)
f = 0.6 × 10^16
f = 6 × 10^15 Hz
In the electromagnetic spectrum (EM), a frequency of 10^15 is found in the ULTRAVIOLET region. This means that this radiation with a wavelength of 5.00 x 10^-6 cm and frequency of 6 × 10^15 Hz is in the ULTRAVIOLET region of the EM spectrum.
Rank the states of matter from particles with the least amount of attraction (1st) to particles with the most attraction (3rd). State of Matter Rank (1st, 2nd, 3rd)
Solid
Liquid
Gas
All parts of the rock cycle are connected, whether directly or indirectly. Which statement
best shows how sedimentary rocks are related to igneous rocks?
1.Under pressure, sedimentary rocks form from igneous rock.
2.Igneous rocks can weather, creating sediments that form sedimentary rocks.
3. During weathering, sedimentary rocks melt and form igneous rock.
4.Under pressure, igneous rock undergoes changes that form sedimentary rock.
Answer:
2. Igneous rocks can weather, creating sediments that form sedimentary rocks
Explanation:
Sedimentary rocks are formed from Igneous rocks when rocks are broken down by weathering.
All can change the Earth suddenly and swiftly except
A. erosion
B. asteroid impact
C. landslide
D. eruption
Answer:
Asteroid impact
Explanation:
:)))) jdiedhdueu
Answer:
A)erosion takes time and besides deposition will come soon after
Explanation:
What does the calculated value of the equilibrium constant, Keq indicate regarding the degree of completeness of the reaction? In other words, at equilibrium, are there mostly products, reactants, or relatively large amounts of both?
Answer:
both
Explanation:
because equilibrium means that both sides of the reaction are equal
The concentration of the products is high at equilibrium if Keq is a large number (Keq > 1). The reaction in this instance encourages the production of products. The concentration of the reactants is high at equilibrium if Keq is a small number (Keq1).
What is equilibrium ?Chemical equilibrium is the condition where both the reactants and products are present in concentrations that have no further tendency to change over time, preventing any discernible change in the system's properties.
The size of a reaction when it is at equilibrium is represented by the equilibrium constant, K. It creates a ratio using the concentrations and coefficients of each reactant and product.
K is regarded as intermediate if it is larger than or equal to 0.001 but less than or equal to 1000. Significant quantities of reactants and products will be present. When the equilibrium constant K is big, products predominate at equilibrium, but when it is small, reactants predominate.
Thus, The concentration of the products is high at equilibrium if Keq is a large number.
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Natasha and Reanna observe a large airplane in the troposphere. Which experimental setup below would best determine how changing wind speeds might affect the airplane’s flight time to its destination?
The airplane's flight time is the test variable (independent variable), the wind speed is the outcome variable (dependent variable), and the airplane is the constant.
The airplane's flight time is the outcome variable (dependent variable), the wind speed is the test variable (independent variable), and the airplane is the constant.
The airplane's flight time is the constant, the wind speed is the outcome variable (dependent variable), and the airplane is the test variable (independent variable).
The airplane's flight time is the test variable (independent variable), the airplane is the outcome variable (dependent variable), and the wind speed is the constant.
Answer:
i am pretty sure the answer is a
Explanation: because the airplane's flight time has to be the independent variable for it to affect the dependent variable that is the speed of how fast the airplane is going.
Independent variables are test variables where we are testing its effects on the dependant variables. Here wind speed is the independent variable and time of flight is dependant variable.
What are variables?Variables are values or components in an experiment which can be measured and will change by time. In an experiment there are two kinds of variables namely independant and dependant variables.
Dependant variables are those which changes with effect of independent variables. For example if we are studying the effect of water quality in the population of fish in a pond. The independent variable is the quality of water and fish population is the dependent variable.
Here the time of flight depends on the wind speed. Thus, flight time is the dependant variable and wind speed is the test variable or independent variable.
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10.8 g of aluminium reacts with excess oxygen to form aluminium oxide: 4Al + 3O2 → 2Al2O3. What is the theoretical yield of aluminium oxide? (Relative masses: Al = 27.0, Al2O3 = 102.0)
Answer:
Theoretical yield = 40.8g
Explanation:
4Al + 3O2 ----] 2Al2O3
if 27.0g of Al ----] 102.0g of 2Al2O3therefore 10.8g -----] xg10.8g×102.0g/ 27.0g
theoretical yield = 40.8 g
Answer:
20.410 grams of Al2O3 are produced
Explanation:
First, we need to calculate the number of moles of aluminum that are actually reacting..
We will convert from grams to moles using the atomic weight which (for aluminum) is 26.982 g/mol (which can also be rewritten as 1 mol/26.982)
10.8 g Al * 1 mol Al/26.982 g Al = 0.4002668446 moles Al
**Grams cancel out, so we are left with moles
(I would type this differently so that it would make more sense visually, however brainly is giving me errors, so try writing it out yourself if it doesn't initially make sense..put the equation in fraction form)
Now that we have the moles of Al, we will convert from moles of Al reacting to moles of aluminum oxide produced..
To do this we will use the balanced chemical equation..
4Al + 3O2 -> 2Al2O3
Using the balanced chemical equation, we can see that for every 4 moles of aluminum that react, 2 moles of aluminum oxide are produced..
0.4002668446 moles Al * 2 mol Al2O3 / 4 mol Al
= 0.2001334223 moles Al2O3..
Now we need to convert from moles of Al2O3 to grams..
We can do this using the atomic weight of Al2O3..
The atomic weight of Al2O3 is 101.961 g/mol or 1 mol/101.961 grams
Now we will convert to grams of Al2O3...
0.2001334223 moles Al2O3 * 101.961 grams Al2O3/1 mol Al2O3
= 20.40580387..
20.410 grams of Al2O3 are produced
An Atom that was neutral has now gained 3 electrons. Do you think this Atom will become a cation or an anion?Why?(In at least 2 sentences.)
Claim
Evidence
Reasoning
Answer: It will become an anion. Anions are negatively charged molecules. So if the molecule is charged by electrons and electrons have a negative charge, it must form an anion.
Explanation:
A substance which retains its magnetic properties for a long period is called a ______.
Answer:
Explanation:
magnet please give brainliest
What is a colander used for?
A
measuring liquid and dry ingredients
B
straining liquid out of food
C
mixing ingredients together
D
separating egg yolks from the whites
Answer:
b is the answer have a good day
Which energy level has the most energy available to it?
4
3
2
1
Calcium solid is placed in a solution of iron (III) chloride producing calcium chloride and iron solid
Answer:
3Ca₍s₎ + 2FeCl₃ -------------------------------------------------------------> 3CaCl₂ + 2Fe₍s₎.
Explanation:
Iron(III) chloride is also known as Iron trichloride and it has the molar mass value of 162.2 g/mol and density of 2.9 g/cm³.
The balanced equation for the chemical reaction between solid calcium and iron (III) chloride is given below as:
3Ca₍s₎ + 2FeCl₃ -------------------------------------------------------------> 3CaCl₂ + 2Fe₍s₎.
This kind of chemical reaction is known as single displacement reaction or single replacement reaction.
Several balloons are inflated with helium to a volume of 0.75 L at 27°C. One of the balloons was found several
hours later, the temperature had dropped to 22°C. What would be the volume of the balloon when found, if no
helium has escaped? (0.74L)
Answer:
V₂ = 0.74 L
Explanation:
Given data:
Initial volume of balloon = 0.75 L
Initial temperature of balloon = 27°C (27+273.15 K = 300.15 K)
Final volume of balloon = ?
Final temperature = 22°C (22+273.15 K = 295.15 k)
Solution:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 0.75 L × 295.15 k / 300.15 K
V₂ = 221.36 L.K / 300.15 K
V₂ = 0.74 L
The given problem is solved through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
Calculate the mass of Na
Answer:
22.98977
Explanation:
Na is actually sodium and its atomic number is 11.
I'm not sure if this is multiple choice or a question where you have to answer in writing but here is the mass of Na 22.98977.
Hope this helps
What is kinetic energy?
What is the weight of 9.228 mol of copper?
Answer in units of g.
Answer:
590.2524g .
Explanation:
Hsaio manages the finances for her company and has a particularly large amount of money budgeted for the purchase of calcium chloride, or CaCl2. Which type of company does Hsaio most likely own?
a snow-plowing service
a cosmetics factory
a pottery art studio
a catering business
Answer:
cosmetics factory
Explanation:
The company owned by Hsaio has been most likely to be the cosmetic factory. Hence, option B is correct.
What is a cosmetics factory?A cosmetic manufacturer is a company that manufactures cosmetic items. The products manufactured by the cosmetic industry include soap, shampoo, and toothpaste that smell good, such as perfume and deodorant.
The cosmetic industry products are formed to be viscous in nature, in order to be applied with ease in personal care. Calcium chloride has been the chemical agent that has been mediating to add viscosity to cosmetic products.
Since, Hsaio has been incorporating most of the budget of his company over calcium chloride, a product used in the cosmetic industry. Thereby he is most likely to own a cosmetic factory. Hence, option B is correct.
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